Dynamic double-frequency power minimization in multi-converter hybrid DC–AC buildings with single-phase inverters
This paper introduces an enhanced control strategy to mitigate DC bus double-frequency power oscillations in a building-integrated DC–AC hybrid microgrid composed of renewable energy sources, energy storage systems, and AC building dwelling loads. Integrating multiple single-phase inverters in a mic...
| Autores: | , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universidad de Oviedo (UNIOVI) |
| Repositorio: | RUO. Repositorio Institucional de la Universidad de Oviedo |
| Idioma: | inglés |
| OAI Identifier: | oai:digibuo.uniovi.es:10651/82247 |
| Acceso en línea: | https://hdl.handle.net/10651/82247 https://dx.doi.org/10.1016/j.ijepes.2025.111443 |
| Access Level: | acceso abierto |
| Palabra clave: | Hybrid building-integrated MG DC bus power oscillation Double-frequency DC–AC single-phase inverter |
| Sumario: | This paper introduces an enhanced control strategy to mitigate DC bus double-frequency power oscillations in a building-integrated DC–AC hybrid microgrid composed of renewable energy sources, energy storage systems, and AC building dwelling loads. Integrating multiple single-phase inverters in a microgrid (MG) produces a double-frequency power oscillation at the DC side, adversely affecting power quality and system stability. To address this issue, an enhanced control strategy is proposed to optimize the voltage reference phase angles for each AC single-phase load inverter by considering factors like load power factor and apparent power. The proposed strategy uses established optimization techniques (i.e., Gradient Descent, Nelder–Mead) to dynamically adjust the voltage phase angles. A total of 10 techniques are evaluated for comparison to determine the most appropriate optimization technique for an increased number of connected inverters. The best technique resulting from the benchmarking is evaluated experimentally. The proposed control strategy increases the DC bus capacitor’s lifetime, reduces switching stress, and improves MG stability by mitigating the double-frequency power oscillation. The feasibility of the proposed method is validated through experimental implementation, considering a real-time lead controller, communications, and real load profiles, including hardware-in-the-loop and respective controllers. The proposed control achieves up to a 93% reduction in low-frequency DC bus power oscillations and also extends the capacitor lifetime 2.5 times. |
|---|